Henby binsse



(No Model.)

H. BINSSE.

, SCREW JACK. No. 283,851. Batented'Aug. 28, 1883.

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'TTRD' STATES HENRY R'iNssn, or New YORK, N. Y..

SCREW-JAC K.

SPECIFICATION 'forming part of Letters Patent No. 283,851, dated August 28, 1883.

Application filed January 30, 1883. (No model.)

To all whom, it may concern:

Be it known that I, HENRY BiNssn, of New York, in the county and State of NewYork, have invented an Improved Screw-Jack, of which the following is a speciiication.

Figure l is a vertical central section of my improved screw-jack; Fig. 2, an elevation of the same. Fig. 3 is a detail face view of the swivel-cap of the jack. Fig. 4 is a detail top view of the jack, the covering-plate having been removed. Fig. 5 is a horizontal section through the lower part of the swivel-cap, the line c c, Fig. 3, indicating the plane of section. Fig. 6 is a detail top view of the grating and friction-rollers, which are interposed between the `collar or head of the screw and the top ofthe movable sleeve. Fig. 7 is a vertical section ofthe upper part of the jack when the screw is somewhat raised.

This invention relates to certain improvements in screw-jacks by which the rotation of the screw in a iixed stand is transmitted to a load-carrying sleeve, whereby the strain is so vdistributed during the lifting action that the entire weight is practically carried by the upper end of the screw, thus removing the tendency toward straining the screw laterally that existed in such jack-screws in which the lifting-foot projected laterally from the lower part of the screw itself. By an arrangement y of parts which involves a rational distribution of strain, much unnecessary thickness of material/ can be dispensed with and a lighter i structure employed, giving better results than can be obtained from the heavy structures that are built upon wrong principles.

My invention principally consists in combining with a stationary casing or stand, which contains the female thread for the liftingscrew, the lifting-screw and an outer sleeve, which, resting on the lifting-screw, bears the weight to be elevated.

The invention also consists in combining with the three elements above named a swiveled cap, which may carry the operating shafts and wheels, as hereinafter stated.

It also consists in further details of improvement, that will be hereinafter more fully speciiied.

In the accompanying drawings, the letter A represents the stationary casing or stand 1to turn on the stand,.if desired.

for the screw-jack, in forni of ahollow vertical column. The upper part of this tubular stand A is screw-threaded for the reception of the threads of the lifting-screw B. The liftingscrew, above the stand A, carries a collar or enlargement, a, which is rigidly attached to or formed in one piece with it. C is the outer shell or sleeve which surrounds the tubular stand A, and which, at its upper end, has firmly screwed into it, or otherwise attached to or formed in it, a top plate, I), through which the non-threaded upper stem of the screw B extends, as shown. This cap b rests on the collar or enlargement a of the screwB, suitable frictional devices being, if desired, interposed between the parts a and b. In this case I have shown a perforated annular grating, d, (sce Fig. 6,) interposed between the parts a and b, said grating containing in its openings conical friction-rollers c, which receive the weight from the top I) of the sleeve C and distribute it to the shoulder c,- but instead of this grating d and the rollers c, any other device that will reduce the friction between the parts c and b may be substituted; or such frictional device, if the contact-surfaces of the parts c b are properly nished and lubricated, may be entirely omitted.

The principle oi' the operation of the jack yis that by turning the screw B' by suitable mechanism the sleeve G will be raised or lowered at will, because it rests upon the collar or enlargement c of the screw 5 hence all the strain or weight on the sleeve G will be brought to bear upon the collar of the screw, and will thus be vertically borne by the screw without any pronounced tendency to lateral twist or displacement. In order to prevent the sleeve C from turning, I prefer to provide it with a pin, f, that enters a groove, g, iir the outer side of the stand A, as indicated in Fig. l, or to provide any analogous contrivance for that purpose; yet the sleeve may be left free The lower IOO which has its bearings in the walls of a hollow ybox-like structure, which I term the' cap,

' dle n or to the spindle 7c, the screw B can be revolved with the requisite speed and power, and when revolved will become vertically displaced in the stand A, and will cause the mov able shell C to travel up or down with it. Any other mechanism for revolving the screw B may, however, be used.

The cap D,which contains the spindles for the operating gears, rests, preferably, on a shoulder, p, which is formed on or secured to the outer wall of the movable sleeve C. The lower part of the cap D-in fact that portion thereof which embraces the upper part of the sleeveV C-is a spring-clamp, as indicated in the horizontal section, Fig.`5, so that by turning the clamping-screw r the cap can be clasped tightly upon the sleeve C. By loosening the screw a" the cap D can be practically freed from the sleeve C, so that it can be turned on it to bring the handle o into any desired position. lVhen this has been accomplished, the screw r is tightened and the cap made part and parcel 'of the sleeve G. The cap carries on its top plate, s, the weight to be lifted. The capD may, however, be directly secured tof or made in one piece with the sleeve C. The jack can be provided with a suitable handle-ring and handles t, placed around the sleeve C, below the shoulder p, as indicated.

It will be perceived that by this device the entire strain comes on to the top of the screw, and that therefore, all lateral strain "on the screw being avoided, I am enabled to use light material in the construction of this screw-jack.

I claim;

1. In a screwjacl,'the combination of the stationary threaded stand A with the 'screw B, having collar or enlargement a, and with the outer sleeve, C, which rests upon said collar or enlargement, and with means, substani tially as described, for turning said screw, as specified.

2. rIhe combination of the threaded stand A with the screw B,.matching the thread of said stand A, and with the movable sleeve C and swiveled cap D, and with mechanism for turning the screw, substantially as described. 3. In combination with the screw B, having collar or enlargement a, the stand A, having Y thread to match the screw B, the outer movable sleeve, C, having head b, and the interposed grating d, and friction-rollers e, substantially as specified. v

HENRY BIN SSE. Vitnesses: HARRY SMITH, VILLY G. E. SCHULTZ. 

